It was not until the 18th century that man realized that the whole of the brain was involved in the working of the mind， ？
| A．was it | B．wasn’t it | C．did they | D．didn’t they |
After years of overwork, my father’s health ____ and he had to retire from business.
| A．broke out. | B．broke up. | C．broke down. | D．broke off. |
_____ you may have, you should gather your courage to face the challenge.
| A．However serious a problem. | B．What a serious problem. |
| C．However a serious problem. | D．What serious a problem. |
—My cousin would like to risk _____ the weight-loss pills rather than _____ in a gym.
—Really? She must be mad.
| A．to take; work out. | B．to take; working out. |
| C．taking; working out. | D．taking; work out. |
Entering the orchard, you will find apple trees are ______ fruit, fragrance drifting around.
| A．filled with | B．heavy with | C．loaded with | D．mixed with |
.The place _____ the bridge is supposed to be built should be _____ the cross-river traffic is the heaviest.
| A．which; where. | B．which; in which. |
| C．at which; which.. | D．at which; where. |